JP2017505241A - Miniature drill and processing method thereof - Google Patents

Abstract

The present invention relates to a miniature drill. A first front blade surface, a first rear blade surface, a second front blade surface, a second rear blade surface installed at a drill front end position, extending from a drill front end to a drill rear end, and extending the first front blade surface. A first spiral groove that intersects the blade surface to form a first cutting blade, and a second spiral blade that is symmetrically installed in the first spiral groove and intersects the second front blade surface to form a second cutting blade. A spiral groove, which is installed at the position of the large head region of the drill, intersects the second front blade surface so that the length of the second cutting blade is smaller than the length of the first cutting blade, and the second spiral groove A miniature drill comprising an offset groove intersecting with [Selection] Figure 1

Description

  The present invention relates to the field of miniature tools, and in particular, to a miniature drill and a processing method thereof.

  Micro vias are one of the important components of a PCB, and the plated micro vias serve as electrical interconnects and device support in the PCB. Micro vias are divided into two types: through holes and blind holes (belly holes are regarded as a kind of through holes). Blind holes are mainly present in the HDI substrate, and through holes are mainly present in single-sided / double-sided substrates, laminated substrates, flexible substrates and package substrates. In recent years, the package substrate has been characterized by the rapid development of FC package substrate due to remarkable advantages such as high pin count, reduced package product area, improved electrical characteristics and heat dissipation, and higher density. CSP package substrates for MCM (multi-chip package) and SIP (system package) are greatly developed and spread quickly, and are widely popular, especially for package substrates such as smartphones and tablet PCs manufactured by Apple and Samsung companies. The application boasts high sales in the field of consumer electronics products. The point of application of high-density laminated substrate technology in IC packages and the point of reducing the manufacturing cost of the package substrate (the cost of the package substrate is about 40% to 50%, taking BGA as an example, and the manufacturing cost of the FC substrate is about 70%. In the main manufacturing countries and districts. Package substrates have become one of the important “weapons” in the development of the microelectronics industry in one country or district.

  The package substrate has a smaller drilling diameter for mechanical drilling, higher drilling density, higher accuracy in the drilling position, and a higher number of stacks than the normal plate material. give.

  1) Since the dust removal is defective, the drill tip excessively generates heat and breaks. 2) The accuracy of the drilling position is low.

  Chinese Patent Application ZL200510105356 proposes a drill structure, which includes a first spiral groove and a second spiral groove, the first spiral groove and the second spiral groove being in a non-centrosymmetric position with respect to the drill rotation center. (The two spiral grooves have a depression angle of 40 ° and less than 180 ° with respect to the rotation center), the land length of the first spiral groove is larger than the second spiral groove, and the second spiral groove Is a blind groove, that is, the second spiral groove does not extend to the rear end of the drill.

  The above design has the following two problems. 1) The spiral groove is non-centrosymmetric with respect to the center of rotation, and the deviation of the drill tip from the center of mass is large, and when the drill is pinched by a lathe and rotates at a high speed, it is too swayed. Further improvement in accuracy is impaired. 2) The length of the second spiral groove is smaller than that of the first spiral groove and is a blind groove. Chips tend to collect in the blind groove, generate heat due to dry friction with the hole wall, and have too many first spiral grooves. In addition, the space in which the dust suction device in the drilling machine sucks in the air in the groove is further reduced, thereby impairing the heat radiation of the drill tip.

  The technical problem to be solved by the present invention is to provide a miniature drill that excels in dust removal and has a high accuracy of a hole processing position, and a processing method thereof.

The object of the present invention is realized by the following solutions. A miniature drill,
A first front blade surface, a first rear blade surface, a second front blade surface, a second rear blade surface installed at a drill tip position;
A first spiral groove extending from a drill tip to a drill rear end and intersecting the first front blade surface to form a first cutting blade, and symmetrically installed in the first spiral groove, the second front blade A second spiral groove that intersects the surface to form a second cutting edge;
An offset groove that is installed in the tip region of the drill and intersects the second front blade surface and intersects the second spiral groove so that the length of the second cutting blade is smaller than the length of the first cutting blade And comprising.

  Preferably, the offset groove further intersects the second rear blade surface such that the length of the intersection between the second rear blade surface and the drill body is smaller than the width of the tool. The area and space of the offset groove are further increased, thereby further improving the heat dissipation efficiency and the air suction efficiency by the dust suction device.

  Preferably, the length of the intersecting portion between the second rear blade surface and the drill body is 0 or more. When the length of the intersection is 0, that is, when the offset groove and the first spiral groove intersect, the air suction capability of the dust suction device extends to the first spiral groove region, thereby discharging hot air faster, and heat dissipation efficiency To improve. Of course, the length of the crossing can be adjusted accordingly to avoid lowering the strength of the drill tip, assuming that the strength of the drill tip is ensured according to the specific drill model number, eg diameter. To do.

  Preferably, the length of the second cutting blade is 0 or more. When the length of the second cutting blade is 0, the second cutting blade completely loses the cutting function, whereby the air suction efficiency of the second spiral groove reaches the maximum state, and the heat dissipation efficiency is further increased.

  Preferably, the offset groove extends from the outside of the second spiral groove to the inside of the second spiral groove, the width of the intersecting region with the second spiral groove is smaller than the width of the second spiral groove, and the depth is increased. Is greater than the depth of the second spiral groove. Thereby, the dust suction device can suck the air in the drill tip region more efficiently and improve the heat radiation efficiency.

  Preferably, the width of the offset groove is larger than the width of the second spiral groove and covers the second spiral groove region. The dust suction device improves the efficiency of sucking air in the drill tip region, and improves the heat dissipation efficiency.

  Preferably, the included angle α between the edge of the offset groove and the edge of the second spiral groove is 180 ° ≧ α> 90 °.

  Preferably, the spiral angle of the offset groove and the spiral angle of the second spiral groove are the same. Depending on the structural strength needs of the drill body, this structure can ensure that the core thickness of the drill tip region is relatively matched.

  Preferably, the spiral angle of the offset groove and the spiral angle of the second spiral groove are different. If the accuracy requirements of the drilling position are different on the premise that strength is secured according to different machining needs, the structure can be adopted to satisfy the requirement of cutting accuracy.

A miniature drill processing method according to claim 1,
A step S1 of grinding the drill tip structure, the first spiral groove and the second spiral groove;
And step S2 of grinding the offset groove.

  According to the present invention, an offset groove is provided in a tip region of the drill, and the offset groove is formed on the second front blade surface so that the length of the second cutting blade is smaller than the length of the first cutting blade. Intersects with the second spiral groove. When the length of the second cutting blade is smaller than the length of the first cutting blade, the chip ability of the second cutting blade is reduced and no longer extends, so the chip of the second spiral groove is reduced and no longer extends. As described above, the dust suction device can suck the air in the drill tip region of the second spiral groove more efficiently, thereby improving the heat dissipation efficiency. In addition, since a larger heat radiating surface is formed in the offset groove, the heat exchange efficiency between the drill tip and air is improved, and the heat radiating efficiency is further improved in combination with the dust suction device sucking air more efficiently.

FIG. 1 is a schematic configuration diagram of a drill tip according to a first embodiment of the present invention. FIG. 2 is a schematic configuration diagram of the tip of the drill body according to the first embodiment of the present invention. FIG. 3 is a schematic configuration diagram of the tip of the drill body according to the first embodiment of the present invention. FIG. 4 is a schematic configuration diagram of the tip of the drill body according to the first embodiment of the present invention. FIG. 5 is a schematic configuration diagram of the tip of the drill body according to the first embodiment of the present invention. FIG. 6 is a schematic configuration diagram of a drill tip according to a second embodiment of the present invention. FIG. 7 is a schematic configuration diagram of the tip of the drill body according to the second embodiment of the present invention. FIG. 8 is a schematic configuration diagram of a drill tip according to a third embodiment of the present invention. FIG. 9 is a schematic configuration diagram of the tip end of the drill body according to the third embodiment of the present invention. FIG. 10 is a schematic configuration diagram of a drill tip according to a fourth embodiment of the present invention. FIG. 11 is a schematic configuration diagram of the tip of the drill body according to the fourth embodiment of the present invention.

  1 to 10 show several embodiments according to the present invention. The miniature drill has a first front blade surface 111, a first rear blade surface 112, and a second front blade that are installed at the drill tip position. A blade surface 121, a second rear blade surface 122, a first spiral groove 10 extending from a drill tip to a drill rear end, intersecting the first front blade surface 111 to form a first cutting blade 110, and the first A second spiral groove that is symmetrically installed in one spiral groove and that intersects the second front blade surface 121 to form a second cutting blade 120; and a tip end region position of the drill; The offset groove 30 intersects with the second front blade surface 121 and intersects with the second spiral groove 20 so that the length of 120 becomes smaller than the length of the first cutting blade 110. When the length of the second cutting blade 120 is smaller than the length of the first cutting blade 110, the chip capability of the second cutting blade 120 is not reduced and extended, and thereby the chips of the second spiral groove 20 are reduced and extended. Thus, the dust suction device can suck the air in the drill tip region of the second spiral groove more efficiently, thereby improving the heat dissipation efficiency. In addition, since a larger heat dissipation surface is formed in the offset groove 30, heat exchange efficiency between the drill tip and air is improved, and coupled with the fact that the dust suction device sucks air more efficiently, heat dissipation efficiency is further improved. .

  The present invention further provides a method for processing the above-mentioned drill. Specifically, according to the conventional drill structure, the structure of the drill tip (first front blade surface 111, first rear blade surface 112, second front blade surface 121). , Including a second rear blade surface 122), a step S1 of grinding the first spiral groove and the second spiral groove, and a step S2 of grinding the offset groove on S1.

  The invention is further described below with reference to the drawings and preferred embodiments.

  Example 1

  As shown in FIGS. 1 to 3, the miniature drill includes a first front blade surface 111, a first rear blade surface 112, a second front blade surface 121, a second rear blade surface 122 installed at a drill tip position, A first spiral groove 10 extending from a drill tip to a drill rear end, intersecting the first front blade surface 111 to form a first cutting blade 110, and symmetrically installed in the first spiral groove, 2 It has the 2nd spiral groove 20 which intersects with front blade surface 121 and forms the 2nd cutting blade 120, and offset groove 30 installed in the tip end region position of a drill. As shown in FIG. 5, the offset groove 30 intersects the second front blade surface 121 such that the length L1 of the second cutting blade 120 is smaller than the length L2 of the first cutting blade 110, Further, it intersects with the second spiral groove 20. Since the depth of the offset groove 30 is larger than the depth of the second spiral groove 20, the space of the offset groove in the drill region is expanded, dust collection efficiency is further increased, and air in the drill tip region can be discharged faster.

  In this embodiment, the offset groove 30 further intersects with the second rear blade surface 122, and as shown in FIG. 3, the length L3 of the intersecting portion between the second rear blade surface 122 and the drill body is thus obtained. It is smaller than the width L4 of the tool, thereby further expanding the area and space of the offset groove, and further improving the heat dissipation efficiency and the air suction efficiency by the dust suction device. In this embodiment, assuming that the value of the intersection is larger than 0, the specific value of the intersection is set according to the specific model number of the drill, for example, the diameter, and the strength of the drill tip is ensured. The size of the part can be adjusted accordingly, avoiding a drop in the strength of the drill tip.

  In this embodiment, the length of the second cutting blade 120 is very small, and thus the cutting ability is largely lost. Thus, the resistance of the dust suction device to suck in air is reduced, and the air suction efficiency is improved. Therefore, heat dissipation efficiency is also improved.

  In the present embodiment, as shown in FIG. 4, the included angle α between the edge of the offset groove 30 and the edge of the second spiral groove 20 is 180 ° ≧ α> 90 °.

  In this embodiment, the length of the second cutting blade 120 is 0 or more. When the length of the second cutting blade 120 is 0, the second cutting blade 120 completely loses the cutting function, whereby the air suction efficiency by the second spiral groove reaches the maximum state, and the heat dissipation efficiency is further increased.

  Example 2

  As shown in FIGS. 6 to 7, the difference from the first embodiment is that the length of the intersection between the second rear blade surface 122 and the drill body of the first embodiment is greater than or equal to zero. . As a result, the offset groove 30 intersects with the first spiral groove 10, and thus the air suction capability of the dust suction device extends to the first spiral groove 10 region, whereby high-temperature air can be discharged faster, and the heat dissipation efficiency is increased. Improve.

  As a design structure of the embodiment, the spiral angle of the offset groove 30 is different from that of the second spiral groove. Since the requirements of drill strength and hole machining position accuracy differ depending on different machining needs, the spiral angle of the offset groove 30 can be selected as necessary.

  Example 3

  As shown in FIGS. 8 to 9, as a difference from the second embodiment, in the present embodiment, the first spiral groove 10 and the second spiral groove 20 are installed symmetrically, and the offset groove 30 is the second spiral groove. Extending from the outside into the second spiral groove 20, the width of the intersection region between the offset groove 30 and the second spiral groove 20 is smaller than the width of the second spiral groove 20, and the depth of the offset groove 30 is the second. It is larger than the depth of the spiral groove 20. By installing in this way, the dust suction device can suck the air in the drill tip region more efficiently and further improve the heat dissipation efficiency. In addition, the spiral angle of the offset groove 30 and the spiral angle of the second spiral groove 20 are the same, and based on the strength needs of the structure of the drill body, the structure is such that the core thickness of the drill tip region is relatively matched. Secure and thereby improve its strength.

  Example 4

  As shown in FIGS. 10 to 11, in this embodiment, the length of the intersection between the second rear blade surface 122 and the drill body is very small and close to zero. With this structure, the area space of the offset groove 30 is maximized, and the heat radiation area and the air suction efficiency are further increased. In the present embodiment, the width of the offset groove 30 is larger than the width of the second spiral groove 20 and covers the second spiral groove 20 region.

As mentioned above, although this invention was demonstrated further in detail with reference to preferable embodiment, embodiment of this invention is not limited to them. Those skilled in the art can make various simple changes and substitutions without departing from the concept of the present invention, and these are also within the protection scope of the present invention.

Claims (10)

A miniature drill,
A first front blade surface, a first rear blade surface, a second front blade surface, a second rear blade surface installed at a drill tip position;
A first spiral groove extending from a drill tip to a drill rear end and intersecting the first front blade surface to form a first cutting blade, and symmetrically installed in the first spiral groove, the second front blade A second spiral groove that intersects the surface to form a second cutting edge;
An offset that is installed in the tip region of the miniature drill and intersects the second front blade surface and intersects the second spiral groove so that the length of the second cutting blade is smaller than the length of the first cutting blade. A miniature drill comprising a groove.   2. The miniature drill according to claim 1, wherein the offset groove further intersects the second rear blade surface such that a length of an intersecting portion between the second rear blade surface and the drill body is smaller than a width of the tool.   The miniature drill according to claim 2, wherein a length of an intersection between the second rear blade surface and the drill main body is 0 or more.   The length of the said 2nd cutting blade is 0 or more, The miniature drill of Claim 1.   The offset groove extends from the outside of the second spiral groove to the inside of the second spiral groove, the width of the intersecting region with the second spiral groove is smaller than the width of the second spiral groove, and the depth is the second. The miniature drill according to claim 1, wherein the drill is larger than the depth of the spiral groove.   The miniature drill according to claim 1, wherein a width of the offset groove is larger than a width of the second spiral groove and covers a second spiral groove region.   2. The miniature drill according to claim 1, wherein a depression angle α between the edge of the offset groove and the edge of the second spiral groove is 180 ° ≧ α> 90 °.   The miniature drill according to claim 1, wherein a spiral angle of the offset groove and a spiral angle of the second spiral groove are the same.   The miniature drill according to claim 1, wherein a spiral angle of the offset groove and a spiral angle of the second spiral groove are different. A processing method for a miniature drill,
A step S1 of grinding the drill tip structure, the first spiral groove and the second spiral groove;
A process for processing a miniature drill, which includes a step S2 of grinding an offset groove.

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